dolthub/dolt#9606 - Fix ALTER TABLE MODIFY COLUMN row count reporting #3132
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- Updated modifyColumnIter.Next() to count and return actual rows affected - Modified rewriteTable() signature to return row count (bool, int, error) - Added countTableRows() helper function for accurate row counting - Handles both rewrite and non-rewrite code paths correctly Fixes dolthub/dolt#9606 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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Fixes dolthub/dolt#9606
ALTER TABLE MODIFY COLUMN was returning "Query OK, 0 rows affected" instead of the actual number of rows affected. This change updates the modifyColumnIter to count and return the actual number of rows affected.